Java- Button

import javax.swing.JFrame;
import javax.swing.*;
import java.awt.*;

public class TrafficLight
{
//-------------------------------------
//Creates the main program frame
//-------------------------------------

public static void main (String[] args)
{

JFrame frame=new JFrame("Traffic Light");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

TrafficLightPanel panel = new TrafficLightPanel();

frame.getContentPane().add(new TrafficLightPanel());

frame.pack();
frame.setVisible(true);
}
}

import javax.swing.JPanel;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TrafficLightPanel extends JPanel
{

private int state;
private JButton status;
private JLabel label;

//--------------------------------------------
//Constructor:Creates three circle objects
//------------------------------------------

public TrafficLightPanel()
{

//----------------------------------------------
//Constructor: Sets up the GUI
//----------------------------------------------

status = new JButton ("State");
status.addActionListener (new ButtonListener());

label = new JLabel ();

add(status);
add (label);

setPreferredSize (new Dimension (300,200));
setBackground (Color.black);
}

//-------------------------------------------------------
//Represents a listener for button status (action) events
//--------------------------------------------------------
private class ButtonListener implements ActionListener
{

//---------------------------------------------------------------
//Updates the state of the traffic light when the button is pushed
//----------------------------------------------------------------
public void actionPerformed (ActionEvent event)
{
state++;

red=1;
yellow=2;
green=3;

status = new JButton("State");
repaint();

}
}

//-------------------------------------------------------------
//Draws this panel by requesting that each circle draw itself
//-------------------------------------------------------------

public void paintComponent (Graphics page)
{
  super.paintComponent(page);

  page.setColor(Color.red);
      page.fillOval(112, 60, 60,60);

      page.setColor(Color.yellow);
      page.fillOval(112, 60, 60,60);

      page.setColor(Color.green);
    page.fillOval(112, 60, 60,60);

page.setColor(Color.white);
page.drawString("Ready...Set...GO!!!",100,180);

}
}